Belt-checking device.



PATENTED FEB. 19, 1907.

- A. DEAN.

BELT GHEGKING DEVICE.

APPLICATION FILED DEU. 12. 1905.

ALEXANDER DEAN, or; DENVER, CQLQRADQ.

Biz-:L T-c'HECKIIM?.A DEVICE.

Specification of Letters Patent.

Patented Feb. 19', 1907.

Application iled December 12,1905. Serial No. 291,489.

To all when@ t muy concern:

Be it known that I, ALEXANDER DEAN, a citizen of the United States,residing in Denver, in the county of Denver' and State of Colorado, haveinvented certain new and useful Improvements in Belt-Checking Devices,of which the following is a full, clear, and eX- act description,reference being had to the accompanying drawings, forming part of thisspecification.

My invention relates to a device for cheeking the movement ofpower-belts used in sewing-machines, the object of the invention beingto prevent retrograde movement of the belt without in any degreeimpeding the proper forward movement of the belt.

Figure I is an end elevation of a sewingmachine, illustrating theadaptability of my belt-checking device in association with the belt ofthe machine. Fig. II is a top or plan view of my belt-checking device,with a belt shown in cross-section between the jaws of the device. Fig.III is a cross-section taken on line III III, Fig. II. Fig. IV is alongitudinal section taken on line IV IV, Fig. II. Fig. V is across-section taken on line V V, Fig. II. Fig. VI is an inverted plan ofthe device.

Referring first to Fig. I of the drawings, A designates the table of asewing-machine B, the driving-wheel, C, the driven wheel, and D the beltby which power is transmitted from the driving-wheel to the drivenwheel.

I designates a frame, preferably of rectangular shape, that is adaptedto be fitted to the table A, preferably by seating it therein. The framemay be secured to the table by any suitable means, suoli as screws. Theframe I is preferably provided at its lower side with flanges 2.

3 designates a pair of belt-gripping jaws that are rockingly positionedwithin the frame 1 and between which the belt D is adapted to operate.The belt-gripping jaws are eccentrically supported for rocking movementby pins or shafts fl, seated therein and fitted in the ends of theframe 1. Each gripping-jaw has at its inner edge and opposing the othergripping-jaw a belt-engaging portion 5, preferably of angular shape inorder that it will be caused to bite into or firmly grip the belt whensaid belt is moved in a downward direction between the jaws. For thepurpose of causing the gripping-jaws to move in unison and act in commonWith gripping effect upon the belt, I provide at one end of each jaw atoothed segment 6, the teeth of these segments being arranged in mesh,as most clearly seen in Figs. III, V, and VI.

In the practical use of my belt-checking device the operation is asfollows: vWhile the belt and the pulleys to which it is applied aretraveling in the direction indicated by the arrow, Fig. I, the belt willtravel freely between the gripping-jaws 3, due to its bearing againstthe inner facing edges of the jaws being such as to tend to throw thejaw-gripping portions away from each other. In the event, however, ofthe belt being moved in the reverse or retrograde direction said beltacts frictionally against the gripping portions of the aws 3, therebytending to throw said gripping portions inwardly, causing them to freelygrip the belt-checking action due to the approach of the grippingportions of the jaws. It will be seen that by reason of the jaws beinggeared together in common by the segments 6 each jaw will act upon thebelt with the same effect. Moreover, I have found that if thegripping-jaws are not geared together the belt is liable to bear againstone jaw only and tend to force it downwardly without forcing the otheraw downwardly, and therefore the gripping action secured is not asperfect as it is by the geared arrangement of the jaws.

The gearing-segments are provided at one end of each jaw only in orderthat there may exist an uninterrupted space between the segments G andthe opposite ends of the jaws. This construction permits of the beltbeing thrown outwardly to the requisite distance by the l )obbin-winderE when said bobbinwinder is in use, as indicated by dotted lines, Fig.I.

lVhile I have shown and described my belt-checking device as applied toa sewingmachine, I wish it understood that I do not limit myself to itsuse in connection with a belt of this particular class of machines, asit may be used to check the movement of various other kinds of machines.

I claim- 1. In a belt-gripping device, the combination of a frame, and apair of belt-gripping jaws rockingly mounted in said frame; said jawsbeing provided with toothed segments IOO IOS

Ineshng- WithY each other, substantially as Z furnish belt-grippingportionsy and means set forth. whereby said jaws are rockinglysupported,

2. In a belt-checking device, the combnasubstantially as set forth. tionof a pair of beltripping jaws 0f greater i ALEXANDER DEAN.

In presence 0f- MAMIE CHARLIE STERNE, HARRY O. WATT.

5 length than the Wi th of the belts to be gripped and geared togetherat one point and spacedapart aside from the gear portions to

